Oil pump "bypass" valve question
05-23-2008, 07:29 AM
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Oil pump "bypass" valve question I removed my stock 99 oil pump and hand ported another stock oil pump from a 2004 LS1 motor with low milage. I followed the how to document posted by 405HP ZO6 here (great writeup). My question is the shimming of the bypass valve and what to use. I had great oil pressure with my last stock pump 40PSI idle hot and this was with a pinched O-Ring (found this when I removed the pump). I am replacing because of the stories I read on early year pumps. Should I leave the bypass valve stock without shims like the one I just removed?
